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November 20, 2023 Verified Sensitive Record Healthcare / Comprehensive Cancer Center

City of Hope Data Breach

Between November 2023 and January 2024, National Cancer Institute-designated clinical research center City of Hope experienced a major cyber intrusion.

827.1 Thousand
Reported Records
7
Data Types
High
Severity
Oct 20, 2026
Last updated

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Exposed Data Types

3 sensitive7
  • Cancer treatment histories
  • Medical records
  • Health insurance information
  • Names
  • Social security numbers
  • Dates of birth
  • Physical addresses

Breach Details

Company NameCity of Hope National Medical Center
SectorHealthcare / Comprehensive Cancer Center
CountryUnited States
Websitecityofhope.org
Breach DateNovember 20, 2023
Sourcebleepingcomputer.com(opens in a new tab)
Last updatedOctober 20, 2026

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About This Breach

The incident compromised sensitive medical records, oncology diagnoses, and Social security numbers for approximately 827,000 cancer patients.

Verification and editorial method

LeakData compares the incident name, date, affected-record count, and exposed data types with accessible sources. Unverified fields are not presented as facts, and records are updated when new evidence becomes available.

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